What is "murmuration"

Murmuration \Mur`mur*a"tion\, n. [L. murmuratio.] The act of murmuring; a murmur. [Obs.]
--Skelton.

n. 1 An act or instance of murmuring. 2 A flock of starlings.

n. a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech [syn: mutter, muttering, murmur, murmuring, mussitation]